(This is the most basic and easiest way to master and implement Java decompilation. It allows you to easily obtain source code, easily see how programmers write it, and make other people's tools their own.
Decompiler jd-gui-0.2.7. windows Frame1.class
Decompiler jd-gui-0.2.7. windows jd-gui.cfg
Decompiler jd-gui-0.2.7. windows jd-gui.exe
Decompiler jd-gui-0.2.7. windows readme.txt
.....)